linux-kernel - [PATCH 4/6] arch: x86: Expose psABI on thread

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Date:   Tue, 28 Jul 2020 16:22:27 -0400
From:   Gabriel Krisman Bertazi <krisman@...labora.com>
To:     luto@...nel.org, tglx@...utronix.de
Cc:     keescook@...omium.org, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Gabriel Krisman Bertazi <krisman@...labora.com>,
        kernel@...labora.com
Subject: [PATCH 4/6] arch: x86: Expose psABI on thread_info

Expose psABI in thread_info, in preparation for the TIF_IA32 and
TIF_X32 flags removal.

Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
---
 arch/x86/include/asm/thread_info.h | 2 ++
 arch/x86/kernel/process_64.c       | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h
index 6d55a9c0dda2..698feefd5f5f 100644
--- a/arch/x86/include/asm/thread_info.h
+++ b/arch/x86/include/asm/thread_info.h
@@ -62,11 +62,13 @@ enum {
 struct thread_info {
 	unsigned long		flags;		/* low level flags */
 	u32			status;		/* thread synchronous flags */
+	short int		psabi;
 };
 
 #define INIT_THREAD_INFO(tsk)			\
 {						\
 	.flags		= 0,			\
+	.psabi		= 0,			\
 }
 
 #else /* !__ASSEMBLY__ */
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index f20a365017b8..aea2c03e8a5d 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -532,6 +532,7 @@ void set_personality_64bit(void)
 	/* inherit personality from parent */
 
 	/* Make sure to be in 64bit mode */
+	current_thread_info()->psabi = PSABI_IA64;
 	clear_thread_flag(TIF_IA32);
 	clear_thread_flag(TIF_ADDR32);
 	clear_thread_flag(TIF_X32);
@@ -553,6 +554,7 @@ void set_personality_64bit(void)
 static void __set_personality_x32(void)
 {
 #ifdef CONFIG_X86_X32
+	current_thread_info()->psabi = PSABI_X32;
 	clear_thread_flag(TIF_IA32);
 	set_thread_flag(TIF_X32);
 	if (current->mm)
@@ -574,6 +576,7 @@ static void __set_personality_x32(void)
 static void __set_personality_ia32(void)
 {
 #ifdef CONFIG_IA32_EMULATION
+	current_thread_info()->psabi = PSABI_IA32;
 	set_thread_flag(TIF_IA32);
 	clear_thread_flag(TIF_X32);
 	if (current->mm)
-- 
2.27.0